Conceptual Physics-Magnetism Unit-Activities 3 and 4 Quiz Flashcards
What is a galvanometer?
It is a device that detects current
How can a magnet be used to induce current?
by moving a magnet and wires around/through each other.
What type of energy transformations are occurring when you move the magnet through the coils?
Mechanical energy changes into electrical energy
What type of energy transformations are occurring in an electric motor?
Electrical energy changes into mechanical energy
How does increasing the speed at which the magnet moves through the wire change the amount of current created?
It increases the amount of current created.
How do you think the amount of coils used will change the amount of current created?
It would increase the current created.
How does moving the magnet towards vs. away from the coil affect the direction of the current?
It reverses the direction of the current, positive vs. negative.
Is current created if the magnet doesn’t move?
No it is not.
Unless the wire is moving.
Name two ways to induce current with a magnet and wires.
Move the magnet or magnetic field through the solenoid.
Move the solenoid over the magnet or magnetic field.
What happens to the needle on the galvanometer when the magnet is moving towards the coils compared to when the magnet is moving away from the coils?
It moves in the opposite directions (positive vs. negative)
What happens to the amount of current induced as you increase the rate at which the magnet spins?
It increases.
What type of current does a generator produce?
Alternating Current
What type of current does a battery produce?
Direct Current
Describe the differences between AC and DC.
AC: goes in two directions and is produced by a generator.
DC: goes in one direction and is produced by batteries.
What must happen to a wire to cause current?
It must perpendicularly cut the flux lines, which are the parts of the magnetic field.
